export const dynamic = 'force-dynamic';
import type { ApiResponse } from '@/types/api';
import type { AnalyticsResponse } from '@/types/analytics';
import { getAnalyticsSummary } from '@/lib/analytics/calculate';
import { generateInsightsFromMetrics } from '@/lib/analytics/insights';

export async function GET(request: Request): Promise<Response> {
  try {
    const { searchParams } = new URL(request.url);
    const period = (searchParams.get('period') || 'weekly') as 'daily' | 'weekly' | 'monthly';

    // Fetch analytics summary
    const summary = await getAnalyticsSummary(period);

    // Generate insights from metrics
    const allInsights = generateInsightsFromMetrics(summary.insights);

    const response: ApiResponse<AnalyticsResponse> = {
      success: true,
      data: {
        period,
        start_date: summary.daily_metrics[summary.daily_metrics.length - 1]?.date || new Date().toISOString().split('T')[0],
        end_date: summary.daily_metrics[0]?.date || new Date().toISOString().split('T')[0],
        total_carousels: summary.total_carousels,
        total_engagement: summary.total_engagement,
        avg_engagement_rate: summary.avg_engagement_rate,
        top_performing_carousel: summary.top_carousel,
        daily_metrics: summary.daily_metrics,
        insights: summary.insights,
      },
    };

    return Response.json(response);
  } catch (error) {
    console.error('[analytics] GET /api/analytics failed:', error);
    return Response.json(
      {
        success: false,
        error: 'Failed to fetch analytics',
      } as ApiResponse<never>,
      { status: 500 }
    );
  }
}